Issue 48, 2023

Shear wave generation from non-spherical bubble collapse in a tissue phantom

Abstract

Elastography is a non-invasive technique to detect tissue anomalies via the local elastic modulus using shear waves. Commonly shear waves are produced via acoustic focusing or the use of mechanical external sources, shear waves may result also naturally from cavitation bubbles during medical intervention, for example from thermal ablation. Here, we measure the shear wave emitted from a well-controlled single laser-induced cavitation bubble oscillating near a rigid boundary. The bubbles are generated in a transparent tissue-mimicking hydrogel embedded with tracer particles. High-speed imaging of the tracer particles and the bubble shape allow quantifying the shear wave and relate it to the bubble dynamics. It is found that different stages of the bubble dynamics contribute to the shear wave generation and the mechanism of shear wave emission, its direction and the efficiency of energy converted into the shear wave depend crucially on the bubble to wall stand-off distance.

Graphical abstract: Shear wave generation from non-spherical bubble collapse in a tissue phantom

Supplementary files

Article information

Article type
Paper
Submitted
14 Aug 2023
Accepted
16 Nov 2023
First published
22 Nov 2023
This article is Open Access
Creative Commons BY-NC license

Soft Matter, 2023,19, 9405-9412

Shear wave generation from non-spherical bubble collapse in a tissue phantom

S. Izak Ghasemian, F. Reuter, Y. Fan, G. Rose and C. Ohl, Soft Matter, 2023, 19, 9405 DOI: 10.1039/D3SM01077E

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